const studyConfig = {
  name: self.addonId,
  duration: 7,
  surveyUrls:  {
    'end-of-study': 'some/url',
    'user-ended-study': 'some/url',
    'ineligible':  null
  },
  variations: {
    'control': () => {},
    'v2': () => feature.which(true)
  }
};
console.log('studyConfig: ', studyConfig);